[SPARK-2859] Update url of Kryo project in related docs
[SPARK-2859] Update url of Kryo project in related docs

JIRA Issue: https://issues.apache.org/jira/browse/SPARK-2859

Kryo project has been migrated from googlecode to github, hence we need to update its URL in related docs such as tuning.md.

Author: Guancheng (G.C.) Chen <chenguancheng@gmail.com>

Closes #1782 from gchen/kryo-docs and squashes the following commits:

b62543c [Guancheng (G.C.) Chen] update url of Kryo project

saturday-shi/spark,metamx/spark,gioenn/xSpark,nchammas/spark,SnappyDataInc/spark,rezasafi/spark,huang1900/spark,holdenk/spark,michalsenkyr/spark,markhamstra/spark,JerryLead/spark,andrewor14/iolap,taroplus/spark,hhbyyh/spark,gengliangwang/spark,wangyum/spark,ueshin/apache-spark,lxsmnv/spark,srowen/spark,zzcclp/spark,setjet/spark,wzhfy/spark,WeichenXu123/spark,ron8hu/spark,facaiy/spark,UndeadBaneGitHub/spark,kissmetrics/spark,1haodian/spark,ahnqirage/spark,vinodkc/spark,mzl9039/spark,LantaoJin/spark,shuangshuangwang/spark,mahak/spark,kiszk/spark,WindCanDie/spark,darionyaphet/spark,akopich/spark,nilsgrabbert/spark,kissmetrics/spark,witgo/spark,brad-kaiser/spark,bravo-zhang/spark,publicRoman/spark,techaddict/spark,loneknightpy/spark,BryanCutler/spark,jkbradley/spark,gioenn/xSpark,jlopezmalla/spark,ioana-delaney/spark,aosagie/spark,alunarbeach/spark,icexelloss/spark,dbtsai/spark,aosagie/spark,caneGuy/spark,facaiy/spark,andrewor14/iolap,joseph-torres/spark,szhem/spark,highfei2011/spark,debugger87/spark,stanzhai/spark,bOOm-X/spark,debugger87/spark,eyalfa/spark,wangmiao1981/spark,bravo-zhang/spark,BryanCutler/spark,xuanyuanking/spark,jianran/spark,tengpeng/spark,jrshust/spark,JoshRosen/spark,skonto/spark,facaiy/spark,darionyaphet/spark,someorz/spark,jkbradley/spark,cloud-fan/spark,ibm-research-ireland/sparkoscope,minixalpha/spark,skonto/spark,debugger87/spark,eyalfa/spark,ibm-research-ireland/sparkoscope,cin/spark,loneknightpy/spark,byakuinss/spark,adrian-ionescu/apache-spark,saltstar/spark,huang1900/spark,publicRoman/spark,setjet/spark,zzcclp/spark,ddna1021/spark,poffuomo/spark,BryanCutler/spark,goldmedal/spark,jkbradley/spark,wangyum/spark,ddna1021/spark,UndeadBaneGitHub/spark,esi-mineset/spark,markhamstra/spark,loneknightpy/spark,akopich/spark,caneGuy/spark,haowu80s/spark,bOOm-X/spark,zuotingbing/spark,nilsgrabbert/spark,rezasafi/spark,cin/spark,holdenk/spark,szhem/spark,byakuinss/spark,andrewor14/iolap,kevinyu98/spark,sahilTakiar/spark,wzhfy/spark,aosagie/spark,holdenk/spark,gengliangwang/spark,aosagie/spark,liutang123/spark,zuotingbing/spark,yanboliang/spark,ConeyLiu/spark,akopich/spark,kimoonkim/spark,kissmetrics/spark,witgo/spark,liutang123/spark,srowen/spark,szhem/spark,rekhajoshm/spark,WindCanDie/spark,liyichao/spark,hvanhovell/spark,ericvandenbergfb/spark,milliman/spark,WeichenXu123/spark,pronix/spark,ioana-delaney/spark,shaneknapp/spark,shaneknapp/spark,sachintyagi22/spark,bOOm-X/spark,shaneknapp/spark,HyukjinKwon/spark,UndeadBaneGitHub/spark,adrian-ionescu/apache-spark,zhouyejoe/spark,SnappyDataInc/spark,ptkool/spark,rezasafi/spark,kissmetrics/spark,kevinyu98/spark,actuaryzhang/spark,andrewor14/spark,kissmetrics/spark,xuanyuanking/spark,kimoonkim/spark,SnappyDataInc/spark,guoxiaolongzte/spark,apache/spark,xflin/spark,guoxiaolongzte/spark,jianran/spark,sachintyagi22/spark,caneGuy/spark,apache/spark,narahari92/spark,mdespriee/spark,jianran/spark,hhbyyh/spark,hhbyyh/spark,skonto/spark,ueshin/apache-spark,witgo/spark,saltstar/spark,srowen/spark,ron8hu/spark,wzhfy/spark,Panos-Bletsos/spark-cost-model-optimizer,pgandhi999/spark,UndeadBaneGitHub/spark,Aegeaner/spark,tejasapatil/spark,nlalevee/spark,big-pegasus/spark,shaneknapp/spark,bdrillard/spark,gioenn/xSpark,gioenn/xSpark,big-pegasus/spark,lvdongr/spark,ptkool/spark,actuaryzhang/spark,metamx/spark,JoshRosen/spark,zuotingbing/spark,someorz/spark,chuckchen/spark,jiangxb1987/spark,apache/spark,wangmiao1981/spark,lxsmnv/spark,apache/spark,aray/spark,alunarbeach/spark,metamx/spark,sachintyagi22/spark,rednaxelafx/apache-spark,nilsgrabbert/spark,cloud-fan/spark,bdrillard/spark,ueshin/apache-spark,LantaoJin/spark,SHASHANKB/spark,darionyaphet/spark,actuaryzhang/spark,rikima/spark,MLnick/spark,mike0sv/spark,sahilTakiar/spark,icexelloss/spark,setjet/spark,andrewor14/spark,wangmiao1981/spark,SnappyDataInc/spark,aosagie/spark,mdespriee/spark,bdrillard/spark,taroplus/spark,akopich/spark,dongjoon-hyun/spark,wzhfy/spark,maropu/spark,byakuinss/spark,debugger87/spark,mzl9039/spark,bravo-zhang/spark,chuckchen/spark,shuangshuangwang/spark,milliman/spark,kiszk/spark,JoshRosen/spark,stanzhai/spark,dongjoon-hyun/spark,eyalfa/spark,shuangshuangwang/spark,rekhajoshm/spark,akopich/spark,sahilTakiar/spark,witgo/spark,markhamstra/spark,Panos-Bletsos/spark-cost-model-optimizer,metamx/spark,rikima/spark,bOOm-X/spark,adrian-ionescu/apache-spark,nlalevee/spark,gioenn/xSpark,aray/spark,icexelloss/spark,jlopezmalla/spark,darionyaphet/spark,shubhamchopra/spark,kevinyu98/spark,caneGuy/spark,janewangfb/spark,jlopezmalla/spark,poffuomo/spark,yanboliang/spark,aokolnychyi/spark,mdespriee/spark,xflin/spark,dongjoon-hyun/spark,cin/spark,jlopezmalla/spark,MLnick/spark,kevinyu98/spark,apache-spark-on-k8s/spark,ioana-delaney/spark,ddna1021/spark,andrewor14/iolap,1haodian/spark,gioenn/xSpark,ajaysaini725/spark,szhem/spark,michalsenkyr/spark,lvdongr/spark,maropu/spark,nchammas/spark,dhruve/spark,andrewor14/spark,narahari92/spark,yanboliang/spark,loneknightpy/spark,joseph-torres/spark,Aegeaner/spark,Jer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